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Predicate add_nb_set/3
 add_nb_set(+Key, !Set) is det
 add_nb_set(+Key, !Set, ?New) is semidet
Insert Key into the set. If a variant (see =@=/2) of Key is already in the set, the set is unchanged and New is unified with false. Otherwise, New is unified with true and a copy of Key is added to the set.
To be done
- Computing the hash for cyclic terms is performed with the help of term_factorized/3, which performs rather poorly.
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